PetSafe Ultra Light Sonic Bark Control Pet Training System

PetSafe Ultra Light Sonic Bark Control System - Anti-Bark Collar from petco.comThe Ultra Light Sonic Bark Collar emits a loud sound that startles your dog, disrupting his barking and discouraging him from continuing. While very effective, it is perfectly harmless.The Ultra Light Sonic Bark Control Anti-Bark Collar, the lightest and smallest on the market, attaches to your dog's existing collar, so he doesn't have to wear a second collar.Adjustable sensitivity level allows you to adjust the system to your dog's unique bark.Complete Anti-Bark Collar system includes:Receiver (1 oz., 1.9 cubic inches): can be attached to your dog's existing collar (one inch width or less, non-metallic).Operations manual.Training manual.6-volt battery module.